SAVE POWER & LONG BATTERY LIFE - Newest low-power technology and top chip could save power 5 times than normal ones. Say goodbye to the troubles of replacing battery frequently. The INCLUDED battery is expected to last 3-6 months. If it is out of power, what you need to do is only replace it, and then you could continue to use the mouse as normal 2.4 G & 1600 DPI - With 2.4 G wireless technique, it could to be connected within 10 meters/ 30 ft. Please try to keep the least obstacles between the mouse and the USB transmitter if you intend to use it by a long distance. Precise optical engine with 1600 DPI tracking positioning could provide you wonderful and amazing experience COMFORTABLE ALL-DAY-LONG - Symmetric design allows to use by right hand, as well as left one. Ergonomic design makes you feel extremely comfortable, especially for long-time use. With comfortable contour design, your wrist will never not be fatigue or painful any more TINY USB RECEIVER - Be